US20150098586A1 - In-car audio system - Google Patents
In-car audio system Download PDFInfo
- Publication number
- US20150098586A1 US20150098586A1 US14/485,187 US201414485187A US2015098586A1 US 20150098586 A1 US20150098586 A1 US 20150098586A1 US 201414485187 A US201414485187 A US 201414485187A US 2015098586 A1 US2015098586 A1 US 2015098586A1
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- United States
- Prior art keywords
- diaphragm
- support plate
- communication channel
- speaker unit
- car audio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005192 partition Methods 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims 11
- 239000002184 metal Substances 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 238000009413 insulation Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
- H04R1/2846—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
- H04R1/2849—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2892—Mountings or supports for transducers
- H04R1/2896—Mountings or supports for transducers for loudspeaker transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
Definitions
- the present disclosure relates to an in-car audio system that has a speaker unit mounted therein using a structural member of a vehicle and that is capable of preventing interference between the sound pressures radiating from the sound radiating side and the opposite side of a diaphragm of the speaker unit.
- In-car audio systems need to have a speaker unit disposed in a limited space of a motor vehicle and form a baffle structure in order to prevent the interference between sound waves radiating from the sound radiating side of a diaphragm to a vehicle interior and opposite-phase sound waves radiating from the opposite side of the diaphragm.
- Japanese Unexamined Patent Application Publication No. 62-137247 describes an in-car audio system including a speaker bracket fixed to a vehicle body and a frame of a speaker unit fixed to the speaker bracket.
- a luggage side rim is disposed on the sound radiating side of the speaker unit, and a speaker grill that covers the sound radiating side of the speaker unit is fixed to the luggage side trim.
- a sound leakage prevention spacer is sandwiched by the speaker unit and the luggage side trim. In this manner, the interference between the sound pressures in a gap between the speaker unit and the speaker grill can be prevented.
- existing in-car audio systems are required to fix a large speaker bracket that supports a speaker unit to the interior of a vehicle body.
- existing in-car audio systems are required to have a member, such as a spacer, attached thereto in order to form a baffle structure for preventing the interference between sound pressures. Accordingly, the number of parts that constitute the in-car audio system increases. Furthermore, the space for accommodating the in-car audio system is required within limited interior space of a vehicle.
- an object of the present disclosure to provide an in-car audio system that allows a speaker unit to be mounted using the structural member of a vehicle and that is capable of preventing interference between the sound pressures on the sound radiating side and the opposite side of a diaphragm of the speaker unit.
- an in-car audio system includes a speaker unit having a diaphragm and a magnetic circuit supported by a frame, where the magnetic circuit drives the diaphragm.
- An outer circumferential portion of the frame is fixed to a surface of a support plate that serves as part of a vehicle structure and that is disposed inward of an exterior panel of the vehicle via a partition wall member having an internal space.
- One side of the diaphragm faces the internal space, and sound wave vibration is provided toward the vehicle interior from the other side of the diaphragm.
- the vehicle has a communication channel formed therein, and the communication channel allows the internal space to communicate with the outside of the vehicle.
- the diaphragm having a cone shape may be supported by the outer circumferential portion of the frame.
- the concave side of the diaphragm may face the internal space, and sound wave vibration may be provided toward the vehicle interior from the convex side of the diaphragm.
- each of the internal space and the communication channel may be used as an acoustic resonance space.
- the speaker unit is supported by the support plate, which is part of the vehicle structure, the need for a speaker bracket serving as a member for fixing the speaker unit can be eliminated.
- a partition wall member is disposed between a surface of the support plate and the speaker unit, and the internal space of the partition wall member and a communication channel that communicates with the outside of the vehicle body are used as an acoustic resonance space. Accordingly, interference between sound waves radiating from both sides of the diaphragm and having opposite phases can be prevented. In addition, a sufficient sound pressure can be provided in the vehicle interior.
- the support plate may have an opening formed therein, and the opening may communicate with the internal space.
- the communication channel may be formed between the exterior panel and the support plate, and the communication channel may allow the internal space to communicate with the outside of the vehicle via the opening.
- a duct connected to the opening be provided between the exterior panel and the support plate, and the communication channel be formed inside the duct.
- the communication channel is formed between the exterior panel, which is part of the vehicle structure, and the support plate. Accordingly, a member that forms a baffle structure need not be disposed in the vehicle interior and, thus, the space of the vehicle interior can be effectively used.
- a spare tire may be disposed inward of the support plate, and the speaker unit may be covered by a wheel that supports the spare tire.
- the in-car audio system can be disposed in a space for a spare tire. Accordingly, the space of the vehicle interior can be more effectively used.
- a wall opening may be formed in part of the partition wall member, and the wall opening may communicate with the communication channel.
- the in-car audio system may further include a duct connected to the wall opening, and the communication channel may be formed inside the duct.
- the diaphragm of the speaker unit may vibrate at a frequency in a sub-woofer frequency range.
- the speaker unit is supported using part of the structure of a vehicle.
- the need for a bracket for mounting the speaker unit can be eliminated.
- the number of structural members can be reduced.
- a space formed between the support plate and the speaker unit and the communication channel extending to the outside of the vehicle are used as an acoustic resonance space, interference between sound waves radiating from both sides of the diaphragm can be prevented.
- a sufficient sound pressure can be delivered to the vehicle interior.
- FIG. 1 is a side view illustrating an example of a vehicle having an in-car audio system mounted therein according to an embodiment of the present disclosure
- FIG. 2 is a cross-sectional view taken along a line II-II of FIG. 1 and illustrating part of the structure of a vehicle and the in-car audio system according to a first exemplary embodiment
- FIG. 3 is a partial enlarged view of FIG. 2 ;
- FIG. 4 is an exploded perspective view of the in-car audio system according to the first exemplary embodiment
- FIG. 5 is a cross-sectional view of an in-car audio system according to a second exemplary embodiment of the present disclosure
- FIG. 6 is a cross-sectional view of an in-car audio system according to a third exemplary embodiment of the present disclosure.
- FIG. 7 is a cross-sectional view of an in-car audio system according to a fourth exemplary embodiment of the present disclosure.
- FIG. 8 is a cross-sectional view of an in-car audio system according to a fifth exemplary embodiment of the present disclosure.
- a vehicle 1 may be a sport utility vehicle (SUV).
- FIGS. 2 and 3 are cross-sectional views of the structure of the right side portion of a rear trunk region 18 of the vehicle 1 taken along a line II-II of FIG. 1 .
- SUV sport utility vehicle
- a metal support plate 3 is disposed inward of a metal exterior panel 2 of the vehicle 1 .
- a metal interior plate 4 is disposed inward of the support plate 3 .
- an in-car audio system 10 according to a first exemplary embodiment of the present disclosure is mounted on the right of the rear trunk region 1 a.
- the in-car audio system 10 includes a speaker unit 20 .
- the speaker unit 20 includes a frame 21 .
- the outer circumferential edge of a diaphragm 22 is supported by an outer circumferential portion 21 a of the frame 21 via an edge member 23 .
- a coil bobbin 24 having a cylindrical shape is joined to a convex side of the diaphragm 22 at the center of the convex portion.
- the coil bobbin 24 is supported by the frame 21 via a damper member 25 .
- the frame 21 has a magnetic circuit 26 fixed thereto.
- the magnetic circuit 26 faces the convex side of the diaphragm 22 .
- the magnetic circuit 26 includes a voice coil 27 fixed to the coil bobbin 24 , a magnet 28 , and a magnetic yoke 29 that applies the magnetic field of the magnet 28 to the voice coil 27 .
- the speaker unit 20 has a first side 20 A to which the outer circumferential portion 21 a of the frame 21 and a concave side of the cone-shaped diaphragm 22 are directed and a second side 20 B to which the convex side of the diaphragm 22 and the magnetic circuit 26 are directed.
- the speaker unit 20 is disposed so that the first side 20 A is directed to the support plate 3 and the second side 20 B is directed to the vehicle interior.
- a partition wall member 11 is disposed between the speaker unit 20 and the support plate 3 .
- the partition wall member 11 serves as a sound insulation spacer. As illustrated in FIG. 4 , the partition wall member 11 has a ring shape, and the partition wall member 11 has a circular internal space 11 a.
- a plurality of mounting holes 11 b are formed in the partition wall member 11 so as to pass through the partition wall member 11 .
- a plurality of mounting holes 21 b are formed in the outer circumferential portion 21 a of the frame 21 of the speaker unit 20 .
- a plurality of female threaded screw holes 3 a are formed in the support plate 3 , which is part of the structure of the vehicle 1 .
- the partition wall member 11 is sandwiched by the support plate 3 and the outer circumferential portion 21 a of the frame 21 .
- fixing screws 12 are inserted into the mounting holes 21 b of the outer circumferential portion 21 a and the mounting holes 11 b of the partition wall member 11 .
- the top end portions of the fixing screws 12 are screwed to the female threaded screw holes 3 a of the support plate 3 .
- the first side 20 A of the speaker unit 20 is directed to an inner surface 3 b of the support plate 3 , and the outer circumferential portion 21 a of the frame 21 is fixed to the inner surface 3 b with a spacing therebetween. Since the partition wall member 11 is disposed between the outer circumferential portion 21 a of the frame 21 and the inner surface 3 b of the support plate 3 , the space between the concave side of the diaphragm 22 and the inner surface 3 b is enclosed by the partition wall member 11 and, thus, is sealed from external air.
- an opening 3 c is formed in the support plate 3 .
- the diameter or the opening area of the opening 3 c may be any value less than or equal to the diameter or the opening area of the partition wall member 11 .
- a duct 14 is disposed in a space between the exterior panel 2 of the vehicle 1 and the support plate 3 .
- An upper end portion 14 a of the duct 14 is connected to the opening 3 c of the support plate 3 .
- a bottom plate 5 of the vehicle body of the vehicle 1 has an external opening 5 a formed therein. The external opening 5 a faces downward.
- a lower end portion 14 b of the duct 14 is connected to the external opening 5 a.
- a communication channel 15 is formed in the duct 14 .
- the communication channel 15 communicates with the internal space 11 a of the partition wall member 11 via the opening 3 c of the support plate 3 .
- the communication channel 15 communicates with the external air outside the vehicle 1 through the external opening 5 a.
- a first acoustic resonance space 13 a is formed by the internal space 11 a of the partition wall member 11 on the first side 20 A of the speaker unit 20 . More specifically, the first acoustic resonance space 13 a is formed as a space surrounded by the concave side surface of the diaphragm 22 , the inner surface 3 b of the support plate 3 , and the partition wall member 11 . In addition, a second acoustic resonance space 13 b is formed by the communication channel 15 in the duct 14 .
- the speaker unit 20 serves as a sub-woofer, which mainly provides the bass with a frequency of 50 Hz to 150 Hz.
- the volume of the second acoustic resonance space 13 b is larger than the volume of the first acoustic resonance space 13 a .
- the first acoustic resonance space 13 a and the second acoustic resonance space 13 b can create Helmholtz resonance or resonance similar to Helmholtz resonance.
- the interior plate 4 has a circular holding concave portion 4 a formed therein in an integrated manner.
- the holding concave portion 4 a holds a spare tire 31 .
- a bottom portion of the holding concave portion 4 a has a circular hole 4 b formed therein.
- the speaker unit 20 and the partition wall member 11 are attached to the inside of the hole 4 b.
- a holding fixture 35 that fixes the spare tire 31 to the vehicle 1 includes a retainer plate 36 and a fixing screw shaft 37 inserted into the retainer plate 36 .
- the support plate 3 has a fixing nut 38 fixed thereto by, for example, welding.
- the fixing nut 38 has a female threaded screw hole 38 a formed therein.
- the wheel (the center disk) 33 has a bulging portion 33 b formed on an inner periphery side of the spare tire 31 .
- the speaker unit 20 is covered by the bulging portion 33 b.
- the second side 20 B of the speaker unit 20 is directed to the vehicle interior.
- the sound waves radiating from the convex side of the diaphragm 22 are directed to the vehicle interior.
- the first side 20 A communicates with the outside of the vehicle 1 via the communication channel 15 formed using the internal space 11 a of the partition wall member 11 and the duct 14 .
- a baffle structure is formed. In this manner, a phenomenon in which the sound waves generated by the vibration of the diaphragm 22 and radiating from the second side 20 B to the vehicle interior and the sound waves emanating from the first side 20 A and having an opposite phase cancel each other out by interference can be prevented.
- the partition wall member 11 is disposed between the frame 21 and the inner surface 3 b of the support plate 3 to form the internal space 11 a , which serves as the first acoustic resonance space 13 a .
- the communication channel 15 in the duct 14 that communicates with the internal space 11 a forms the second acoustic resonance space 13 b.
- the first acoustic resonance space 13 a can be formed between the diaphragm 22 and the inner surface 3 b of the support plate 3 even when the opening diameter (the opening area) of the opening 3 c formed in the support plate 3 is sufficiently less than the diameter (the area) of the diaphragm 22 .
- the second acoustic resonance space 13 b that communicates with the external air using the communication channel 15 in the duct 14 is formed.
- Helmholtz resonance or resonance similar to Helmholtz resonance can be created using the first acoustic resonance space 13 a and the second acoustic resonance space 13 b .
- Such resonance allows the diaphragm 22 to be driven with a large amplitude.
- excellent bass sounds can be sent to the vehicle interior at a large sound pressure level.
- the speaker unit 20 Since, in the in-car audio system 10 , the speaker unit 20 is fixed to the support plate 3 , which is a structural member of the vehicle 1 , the need for a speaker bracket that is used in existing in-car audio systems can be eliminated. Since the speaker unit 20 can be mounted by using only the partition wall member 11 and the fixing screws 12 , the number of parts for mounting the speaker unit 20 on the vehicle 1 can be reduced. In addition, since the speaker unit 20 is mounted so that the outer circumferential portion 21 a of the frame 21 faces the inner surface 3 b of the support plate 3 in parallel, the projection of the speaker unit 20 from the inner surface 3 b can be reduced.
- the speaker unit 20 is disposed at a location at which the speaker unit 20 is covered by the wheel 33 that holds the spare tire 31 , the speaker unit 20 does not appear in the vehicle interior. Accordingly, the space of the vehicle interior can be effectively used.
- the first acoustic resonance space 13 a can be formed between the speaker unit 20 and the inner surface 3 b of the support plate 3 and, thus, the Helmholtz resonance or resonance similar to the Helmholtz resonance can be created. Accordingly, the need for matching the opening area of the opening 3 c of the support plate 3 to the diameter of the first side 20 A of the speaker unit 20 can be eliminated. Accordingly, an existing hole formed in the vehicle 1 can be used as the opening 3 c . Alternatively, even when an opening is formed in post-processing, the opening area can be reduced. Thus, in such a case, the duct 14 having a small diameter can be used.
- FIG. 5 illustrates an in-car audio system 110 according to a second exemplary embodiment of the present disclosure.
- part of the interior plate 4 located closest to the vehicle interior among members that constitute the vehicle 1 is used as a support plate 4 c .
- the outer circumferential portion 21 a of the frame 21 of the speaker unit 20 is fixed to the inner surface of the support plate 4 c that faces the vehicle interior via the partition wall member 11 .
- An opening 4 d is formed in the support plate 4 c at a position at which the first side 20 A of the speaker unit 20 faces the support plate 4 c .
- a duct 114 is formed between the support plate 4 c , which is part of the interior plate 4 , and the support plate 3 located outward of the support plate 4 c .
- a communication channel 115 in the duct 114 is connected to the opening 4 d .
- the communication channel 115 opens to a space between the support plate 3 and the exterior panel 2 .
- the communication channel 115 communicates with a space outside the vehicle through the space between the support plate 3 and the exterior panel 2 .
- the first acoustic resonance space 13 a is formed between the first side 20 A of the speaker unit 20 and the support plate 4 c and between the first side 20 A and the partition wall member 11 .
- the communication channel 115 in the duct 114 functions as the second acoustic resonance space 13 b.
- FIG. 6 illustrates an in-car audio system 210 according to a third exemplary embodiment of the present disclosure.
- the in-car audio system 210 part of the interior plate 4 of the vehicle 1 is used as the support plate 4 c .
- a partition wall member 211 and the speaker unit 20 are fixed to the inner surface of the support plate 4 c that faces the vehicle interior.
- a wall opening 211 b is formed in part of the partition wall member 211 .
- the wall opening 211 b communicates with a communication channel 215 partitioned by a partition wall 214 .
- a duct may be connected to the wall opening 211 b to form the communication channel 215 .
- the communication channel 215 communicates with a space outside the vehicle through the external opening 5 a formed in the bottom plate 5 of the vehicle 1 .
- the first acoustic resonance space 13 a is formed between the first side 20 A of the speaker unit 20 and the support plate 4 c and between the first side 20 A and the partition wall member 211 .
- the communication channel 215 functions as the second acoustic resonance space 13 b.
- the first side 20 A of the speaker unit 20 faces the surfaces of the support plate 3 or the support plate 4 c .
- the concave side of the cone-shaped diaphragm 22 faces the internal space 11 a of the partition wall member 11 or internal space 211 a of the partition wall member 211 .
- the large first acoustic resonance space 13 a can be formed between the diaphragm 22 and the support plate 3 or between the diaphragm 22 and the support plate 4 c .
- projection of the speaker unit 20 into the vehicle interior can be reduced.
- FIG. 7 illustrates an in-car audio system 310 according to a fourth exemplary embodiment of the present disclosure.
- a partition wall member 311 having a large size in the right-left direction of FIG. 7 is provided.
- the first side 20 A of the speaker unit 20 supported by the partition wall member 311 faces the vehicle interior.
- the second side 20 B of the speaker unit 20 faces the support plate 3 .
- a plurality of holes are formed in the frame 21 of the speaker unit 20 .
- the first acoustic resonance space 13 a is formed between the convex side of the diaphragm 22 and the support plate 3 .
- FIG. 8 illustrates an in-car audio system 410 according to a fifth exemplary embodiment of the present disclosure.
- the outer circumferential portion of the frame 21 of a speaker unit 120 is fixed to the partition wall member 11 .
- a first side 120 A of the speaker unit 120 faces the vehicle interior, and a second side 120 B of the speaker unit 120 faces the support plate 3 .
- the magnetic circuit 26 is disposed so as to be adjacent to the support plate 3 .
- the diaphragm 22 is disposed so as to be adjacent to the vehicle interior.
- the concave side of the diaphragm 22 of the diaphragm 22 faces the support plate 3 , and the first acoustic resonance space 13 a is formed between the concave side of the diaphragm 22 and the support plate 3 .
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Multimedia (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Body Structure For Vehicles (AREA)
Abstract
Description
- The present application claims priority to Japanese Application Number 2013-208423, filed Oct. 3, 2013, the entirety of which is hereby incorporated by reference.
- 1. Field
- The present disclosure relates to an in-car audio system that has a speaker unit mounted therein using a structural member of a vehicle and that is capable of preventing interference between the sound pressures radiating from the sound radiating side and the opposite side of a diaphragm of the speaker unit.
- 2. Description of the Related Art
- In-car audio systems need to have a speaker unit disposed in a limited space of a motor vehicle and form a baffle structure in order to prevent the interference between sound waves radiating from the sound radiating side of a diaphragm to a vehicle interior and opposite-phase sound waves radiating from the opposite side of the diaphragm.
- Japanese Unexamined Patent Application Publication No. 62-137247 describes an in-car audio system including a speaker bracket fixed to a vehicle body and a frame of a speaker unit fixed to the speaker bracket. A luggage side rim is disposed on the sound radiating side of the speaker unit, and a speaker grill that covers the sound radiating side of the speaker unit is fixed to the luggage side trim.
- In addition, to prevent the interference between sound pressures having opposite phases, a sound leakage prevention spacer is sandwiched by the speaker unit and the luggage side trim. In this manner, the interference between the sound pressures in a gap between the speaker unit and the speaker grill can be prevented.
- As described in Japanese Unexamined Patent Application Publication No. 62-137247, existing in-car audio systems are required to fix a large speaker bracket that supports a speaker unit to the interior of a vehicle body. In addition, existing in-car audio systems are required to have a member, such as a spacer, attached thereto in order to form a baffle structure for preventing the interference between sound pressures. Accordingly, the number of parts that constitute the in-car audio system increases. Furthermore, the space for accommodating the in-car audio system is required within limited interior space of a vehicle.
- Accordingly, it is an object of the present disclosure to provide an in-car audio system that allows a speaker unit to be mounted using the structural member of a vehicle and that is capable of preventing interference between the sound pressures on the sound radiating side and the opposite side of a diaphragm of the speaker unit.
- According to an embodiment of the present disclosure, an in-car audio system includes a speaker unit having a diaphragm and a magnetic circuit supported by a frame, where the magnetic circuit drives the diaphragm. An outer circumferential portion of the frame is fixed to a surface of a support plate that serves as part of a vehicle structure and that is disposed inward of an exterior panel of the vehicle via a partition wall member having an internal space. One side of the diaphragm faces the internal space, and sound wave vibration is provided toward the vehicle interior from the other side of the diaphragm. The vehicle has a communication channel formed therein, and the communication channel allows the internal space to communicate with the outside of the vehicle.
- In the in-car audio system, the diaphragm having a cone shape may be supported by the outer circumferential portion of the frame. The concave side of the diaphragm may face the internal space, and sound wave vibration may be provided toward the vehicle interior from the convex side of the diaphragm. In addition, each of the internal space and the communication channel may be used as an acoustic resonance space.
- In the in-car audio system according to the present disclosure, since the speaker unit is supported by the support plate, which is part of the vehicle structure, the need for a speaker bracket serving as a member for fixing the speaker unit can be eliminated. In addition, a partition wall member is disposed between a surface of the support plate and the speaker unit, and the internal space of the partition wall member and a communication channel that communicates with the outside of the vehicle body are used as an acoustic resonance space. Accordingly, interference between sound waves radiating from both sides of the diaphragm and having opposite phases can be prevented. In addition, a sufficient sound pressure can be provided in the vehicle interior.
- The support plate may have an opening formed therein, and the opening may communicate with the internal space. The communication channel may be formed between the exterior panel and the support plate, and the communication channel may allow the internal space to communicate with the outside of the vehicle via the opening.
- In such a case, it is desirable that a duct connected to the opening be provided between the exterior panel and the support plate, and the communication channel be formed inside the duct.
- In the above-described in-car audio system, the communication channel is formed between the exterior panel, which is part of the vehicle structure, and the support plate. Accordingly, a member that forms a baffle structure need not be disposed in the vehicle interior and, thus, the space of the vehicle interior can be effectively used.
- A spare tire may be disposed inward of the support plate, and the speaker unit may be covered by a wheel that supports the spare tire.
- In such a configuration, the in-car audio system can be disposed in a space for a spare tire. Accordingly, the space of the vehicle interior can be more effectively used.
- A wall opening may be formed in part of the partition wall member, and the wall opening may communicate with the communication channel.
- In such a case, the in-car audio system may further include a duct connected to the wall opening, and the communication channel may be formed inside the duct.
- The diaphragm of the speaker unit may vibrate at a frequency in a sub-woofer frequency range.
- According to the in-car audio system of the present disclosure, the speaker unit is supported using part of the structure of a vehicle. Thus, the need for a bracket for mounting the speaker unit can be eliminated. Thus, the number of structural members can be reduced. In addition, since a space formed between the support plate and the speaker unit and the communication channel extending to the outside of the vehicle are used as an acoustic resonance space, interference between sound waves radiating from both sides of the diaphragm can be prevented. Furthermore, a sufficient sound pressure can be delivered to the vehicle interior.
-
FIG. 1 is a side view illustrating an example of a vehicle having an in-car audio system mounted therein according to an embodiment of the present disclosure; -
FIG. 2 is a cross-sectional view taken along a line II-II ofFIG. 1 and illustrating part of the structure of a vehicle and the in-car audio system according to a first exemplary embodiment; -
FIG. 3 is a partial enlarged view ofFIG. 2 ; -
FIG. 4 is an exploded perspective view of the in-car audio system according to the first exemplary embodiment; -
FIG. 5 is a cross-sectional view of an in-car audio system according to a second exemplary embodiment of the present disclosure; -
FIG. 6 is a cross-sectional view of an in-car audio system according to a third exemplary embodiment of the present disclosure; -
FIG. 7 is a cross-sectional view of an in-car audio system according to a fourth exemplary embodiment of the present disclosure; and -
FIG. 8 is a cross-sectional view of an in-car audio system according to a fifth exemplary embodiment of the present disclosure. - As illustrated in
FIG. 1 , avehicle 1 may be a sport utility vehicle (SUV).FIGS. 2 and 3 are cross-sectional views of the structure of the right side portion of a rear trunk region 18 of thevehicle 1 taken along a line II-II ofFIG. 1 . - As illustrated in
FIGS. 2 and 3 , in therear trunk region 1 a, ametal support plate 3 is disposed inward of a metalexterior panel 2 of thevehicle 1. In addition, a metalinterior plate 4 is disposed inward of thesupport plate 3. Furthermore, an in-car audio system 10 according to a first exemplary embodiment of the present disclosure is mounted on the right of therear trunk region 1 a. - The in-
car audio system 10 includes aspeaker unit 20. As can be seen from the enlarged view ofFIG. 3 , thespeaker unit 20 includes aframe 21. The outer circumferential edge of adiaphragm 22 is supported by an outercircumferential portion 21 a of theframe 21 via anedge member 23. Acoil bobbin 24 having a cylindrical shape is joined to a convex side of thediaphragm 22 at the center of the convex portion. Thecoil bobbin 24 is supported by theframe 21 via adamper member 25. - The
frame 21 has amagnetic circuit 26 fixed thereto. Themagnetic circuit 26 faces the convex side of thediaphragm 22. Themagnetic circuit 26 includes avoice coil 27 fixed to thecoil bobbin 24, amagnet 28, and amagnetic yoke 29 that applies the magnetic field of themagnet 28 to thevoice coil 27. - As illustrated in
FIGS. 2 and 3 , thespeaker unit 20 has afirst side 20A to which the outercircumferential portion 21 a of theframe 21 and a concave side of the cone-shapeddiaphragm 22 are directed and asecond side 20B to which the convex side of thediaphragm 22 and themagnetic circuit 26 are directed. Thespeaker unit 20 is disposed so that thefirst side 20A is directed to thesupport plate 3 and thesecond side 20B is directed to the vehicle interior. - A
partition wall member 11 is disposed between thespeaker unit 20 and thesupport plate 3. Thepartition wall member 11 serves as a sound insulation spacer. As illustrated inFIG. 4 , thepartition wall member 11 has a ring shape, and thepartition wall member 11 has a circularinternal space 11 a. - As illustrated in
FIG. 4 , a plurality of mountingholes 11 b are formed in thepartition wall member 11 so as to pass through thepartition wall member 11. A plurality of mountingholes 21 b are formed in the outercircumferential portion 21 a of theframe 21 of thespeaker unit 20. A plurality of female threadedscrew holes 3 a are formed in thesupport plate 3, which is part of the structure of thevehicle 1. Thepartition wall member 11 is sandwiched by thesupport plate 3 and the outercircumferential portion 21 a of theframe 21. Thereafter, fixingscrews 12 are inserted into the mountingholes 21 b of the outercircumferential portion 21 a and the mountingholes 11 b of thepartition wall member 11. The top end portions of the fixing screws 12 are screwed to the female threadedscrew holes 3 a of thesupport plate 3. - As illustrated in
FIGS. 2 and 3 , thefirst side 20A of thespeaker unit 20 is directed to aninner surface 3 b of thesupport plate 3, and the outercircumferential portion 21 a of theframe 21 is fixed to theinner surface 3 b with a spacing therebetween. Since thepartition wall member 11 is disposed between the outercircumferential portion 21 a of theframe 21 and theinner surface 3 b of thesupport plate 3, the space between the concave side of thediaphragm 22 and theinner surface 3 b is enclosed by thepartition wall member 11 and, thus, is sealed from external air. - As illustrated in
FIGS. 2 and 3 , anopening 3 c is formed in thesupport plate 3. The diameter or the opening area of theopening 3 c may be any value less than or equal to the diameter or the opening area of thepartition wall member 11. In addition, aduct 14 is disposed in a space between theexterior panel 2 of thevehicle 1 and thesupport plate 3. Anupper end portion 14 a of theduct 14 is connected to theopening 3 c of thesupport plate 3. Abottom plate 5 of the vehicle body of thevehicle 1 has anexternal opening 5 a formed therein. Theexternal opening 5 a faces downward. Alower end portion 14 b of theduct 14 is connected to theexternal opening 5 a. - A
communication channel 15 is formed in theduct 14. Thecommunication channel 15 communicates with theinternal space 11 a of thepartition wall member 11 via theopening 3 c of thesupport plate 3. In addition, thecommunication channel 15 communicates with the external air outside thevehicle 1 through theexternal opening 5 a. - A first
acoustic resonance space 13 a is formed by theinternal space 11 a of thepartition wall member 11 on thefirst side 20A of thespeaker unit 20. More specifically, the firstacoustic resonance space 13 a is formed as a space surrounded by the concave side surface of thediaphragm 22, theinner surface 3 b of thesupport plate 3, and thepartition wall member 11. In addition, a secondacoustic resonance space 13 b is formed by thecommunication channel 15 in theduct 14. - The
speaker unit 20 serves as a sub-woofer, which mainly provides the bass with a frequency of 50 Hz to 150 Hz. The volume of the secondacoustic resonance space 13 b is larger than the volume of the firstacoustic resonance space 13 a. Thus, the firstacoustic resonance space 13 a and the secondacoustic resonance space 13 b can create Helmholtz resonance or resonance similar to Helmholtz resonance. - As illustrated in
FIG. 2 , theinterior plate 4 has a circular holdingconcave portion 4 a formed therein in an integrated manner. The holdingconcave portion 4 a holds aspare tire 31. A bottom portion of the holdingconcave portion 4 a has acircular hole 4 b formed therein. Thespeaker unit 20 and thepartition wall member 11 are attached to the inside of thehole 4 b. - An inner diameter portion of the
spare tire 31 is held by aflange 32. Theflange 32 is fixed to the outer periphery of a wheel (a center disk) 33. A holdingfixture 35 that fixes thespare tire 31 to thevehicle 1 includes aretainer plate 36 and a fixingscrew shaft 37 inserted into theretainer plate 36. Thesupport plate 3 has a fixingnut 38 fixed thereto by, for example, welding. The fixingnut 38 has a female threadedscrew hole 38 a formed therein. - To mount the
spare tire 31 to the holdingconcave portion 4 a, the fixingscrew shaft 37 is inserted into acenter hole 33 a of thewheel 33. Thereafter, the top end of the fixingscrew shaft 37 is screwed into the female threadedscrew hole 38 a of the fixingnut 38, and the fixingscrew shaft 37 is tightened. If the fixingscrew shaft 37 is tightened, theretainer plate 36 urges the center portion of thewheel 33 against thesupport plate 3. Thus, thespare tire 31 is held in the holdingconcave portion 4 a of theinterior plate 4. - The wheel (the center disk) 33 has a bulging
portion 33 b formed on an inner periphery side of thespare tire 31. When thespare tire 31 is held in the holdingconcave portion 4 a of theinterior plate 4, thespeaker unit 20 is covered by the bulgingportion 33 b. - In the in-
car audio system 10 illustrated inFIGS. 2 to 4 , thesecond side 20B of thespeaker unit 20 is directed to the vehicle interior. Thus, the sound waves radiating from the convex side of thediaphragm 22 are directed to the vehicle interior. In contrast, thefirst side 20A communicates with the outside of thevehicle 1 via thecommunication channel 15 formed using theinternal space 11 a of thepartition wall member 11 and theduct 14. - By sealing the
first side 20A of thespeaker unit 20 using thepartition wall member 11 and theduct 14 and allowing thefirst side 20A to communicate with the outside of thevehicle 1, a baffle structure is formed. In this manner, a phenomenon in which the sound waves generated by the vibration of thediaphragm 22 and radiating from thesecond side 20B to the vehicle interior and the sound waves emanating from thefirst side 20A and having an opposite phase cancel each other out by interference can be prevented. - On the
first side 20A of thespeaker unit 20, thepartition wall member 11 is disposed between theframe 21 and theinner surface 3 b of thesupport plate 3 to form theinternal space 11 a, which serves as the firstacoustic resonance space 13 a. Thecommunication channel 15 in theduct 14 that communicates with theinternal space 11 a forms the secondacoustic resonance space 13 b. - By providing the
partition wall member 11, the firstacoustic resonance space 13 a can be formed between thediaphragm 22 and theinner surface 3 b of thesupport plate 3 even when the opening diameter (the opening area) of theopening 3 c formed in thesupport plate 3 is sufficiently less than the diameter (the area) of thediaphragm 22. In addition, since the secondacoustic resonance space 13 b that communicates with the external air using thecommunication channel 15 in theduct 14 is formed. Helmholtz resonance or resonance similar to Helmholtz resonance can be created using the firstacoustic resonance space 13 a and the secondacoustic resonance space 13 b. Such resonance allows thediaphragm 22 to be driven with a large amplitude. Thus, excellent bass sounds can be sent to the vehicle interior at a large sound pressure level. - Since, in the in-
car audio system 10, thespeaker unit 20 is fixed to thesupport plate 3, which is a structural member of thevehicle 1, the need for a speaker bracket that is used in existing in-car audio systems can be eliminated. Since thespeaker unit 20 can be mounted by using only thepartition wall member 11 and the fixing screws 12, the number of parts for mounting thespeaker unit 20 on thevehicle 1 can be reduced. In addition, since thespeaker unit 20 is mounted so that the outercircumferential portion 21 a of theframe 21 faces theinner surface 3 b of thesupport plate 3 in parallel, the projection of thespeaker unit 20 from theinner surface 3 b can be reduced. - If, as illustrated in
FIG. 2 , thespeaker unit 20 is disposed at a location at which thespeaker unit 20 is covered by thewheel 33 that holds thespare tire 31, thespeaker unit 20 does not appear in the vehicle interior. Accordingly, the space of the vehicle interior can be effectively used. - By providing the
partition wall member 11 in the in-car audio system 10, the firstacoustic resonance space 13 a can be formed between thespeaker unit 20 and theinner surface 3 b of thesupport plate 3 and, thus, the Helmholtz resonance or resonance similar to the Helmholtz resonance can be created. Accordingly, the need for matching the opening area of theopening 3 c of thesupport plate 3 to the diameter of thefirst side 20A of thespeaker unit 20 can be eliminated. Accordingly, an existing hole formed in thevehicle 1 can be used as theopening 3 c. Alternatively, even when an opening is formed in post-processing, the opening area can be reduced. Thus, in such a case, theduct 14 having a small diameter can be used. -
FIG. 5 illustrates an in-car audio system 110 according to a second exemplary embodiment of the present disclosure. In the in-car audio system 110, part of theinterior plate 4 located closest to the vehicle interior among members that constitute thevehicle 1 is used as asupport plate 4 c. The outercircumferential portion 21 a of theframe 21 of thespeaker unit 20 is fixed to the inner surface of thesupport plate 4 c that faces the vehicle interior via thepartition wall member 11. - An
opening 4 d is formed in thesupport plate 4 c at a position at which thefirst side 20A of thespeaker unit 20 faces thesupport plate 4 c. Aduct 114 is formed between thesupport plate 4 c, which is part of theinterior plate 4, and thesupport plate 3 located outward of thesupport plate 4 c. Acommunication channel 115 in theduct 114 is connected to theopening 4 d. In addition, thecommunication channel 115 opens to a space between thesupport plate 3 and theexterior panel 2. Furthermore, thecommunication channel 115 communicates with a space outside the vehicle through the space between thesupport plate 3 and theexterior panel 2. - In the in-
car audio system 110 illustrated inFIG. 5 , the firstacoustic resonance space 13 a is formed between thefirst side 20A of thespeaker unit 20 and thesupport plate 4 c and between thefirst side 20A and thepartition wall member 11. Thecommunication channel 115 in theduct 114 functions as the secondacoustic resonance space 13 b. -
FIG. 6 illustrates an in-car audio system 210 according to a third exemplary embodiment of the present disclosure. In the in-car audio system 210, part of theinterior plate 4 of thevehicle 1 is used as thesupport plate 4 c. Apartition wall member 211 and thespeaker unit 20 are fixed to the inner surface of thesupport plate 4 c that faces the vehicle interior. - A
wall opening 211 b is formed in part of thepartition wall member 211. Thewall opening 211 b communicates with acommunication channel 215 partitioned by apartition wall 214. Alternatively, a duct may be connected to the wall opening 211 b to form thecommunication channel 215. Thecommunication channel 215 communicates with a space outside the vehicle through theexternal opening 5 a formed in thebottom plate 5 of thevehicle 1. - Like the second exemplary embodiment, according to the present exemplary embodiment, the first
acoustic resonance space 13 a is formed between thefirst side 20A of thespeaker unit 20 and thesupport plate 4 c and between thefirst side 20A and thepartition wall member 211. In addition, thecommunication channel 215 functions as the secondacoustic resonance space 13 b. - According to the exemplary embodiments illustrated in
FIGS. 2 to 6 . thefirst side 20A of thespeaker unit 20 faces the surfaces of thesupport plate 3 or thesupport plate 4 c. In such a configuration, the concave side of the cone-shapeddiaphragm 22 faces theinternal space 11 a of thepartition wall member 11 or internal space 211 a of thepartition wall member 211. Accordingly, the large firstacoustic resonance space 13 a can be formed between thediaphragm 22 and thesupport plate 3 or between thediaphragm 22 and thesupport plate 4 c. In addition, projection of thespeaker unit 20 into the vehicle interior can be reduced. -
FIG. 7 illustrates an in-car audio system 310 according to a fourth exemplary embodiment of the present disclosure. In the in-car audio system 310, apartition wall member 311 having a large size in the right-left direction ofFIG. 7 is provided. Thefirst side 20A of thespeaker unit 20 supported by thepartition wall member 311 faces the vehicle interior. Thesecond side 20B of thespeaker unit 20 faces thesupport plate 3. A plurality of holes are formed in theframe 21 of thespeaker unit 20. Ininternal space 311 a of thepartition wall member 311, the firstacoustic resonance space 13 a is formed between the convex side of thediaphragm 22 and thesupport plate 3. -
FIG. 8 illustrates an in-car audio system 410 according to a fifth exemplary embodiment of the present disclosure. In the in-car audio system 410, the outer circumferential portion of theframe 21 of aspeaker unit 120 is fixed to thepartition wall member 11. Afirst side 120A of thespeaker unit 120 faces the vehicle interior, and asecond side 120B of thespeaker unit 120 faces thesupport plate 3. Themagnetic circuit 26 is disposed so as to be adjacent to thesupport plate 3. Thediaphragm 22 is disposed so as to be adjacent to the vehicle interior. In addition, the concave side of thediaphragm 22 of thediaphragm 22 faces thesupport plate 3, and the firstacoustic resonance space 13 a is formed between the concave side of thediaphragm 22 and thesupport plate 3.
Claims (20)
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JP2013208423A JP6289008B2 (en) | 2013-10-03 | 2013-10-03 | In-vehicle audio equipment |
JP2013-208423 | 2013-10-03 |
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US20150098586A1 true US20150098586A1 (en) | 2015-04-09 |
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US14/485,187 Active 2035-04-07 US9591388B2 (en) | 2013-10-03 | 2014-09-12 | In-car audio system |
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EP (1) | EP2858377B1 (en) |
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US20180020290A1 (en) * | 2015-01-28 | 2018-01-18 | Harman International Industries, Incorporated | Vehicle speaker arrangement |
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US20190248297A1 (en) * | 2018-01-16 | 2019-08-15 | Bose Corporation | Waveguide enabled externally ducted vehicle loudspeaker |
US10631081B2 (en) | 2015-05-04 | 2020-04-21 | Harman International Industries, Incorporated | Venting system for vehicle speaker assembly |
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US20210204046A1 (en) * | 2019-12-31 | 2021-07-01 | Harman International Industries, Incorporated | Loudspeaker assembly for providing audio external to a vehicle |
US20220240007A1 (en) * | 2019-05-09 | 2022-07-28 | Sony Group Corporation | Loudspeaker apparatus, loudspeaker, and structure |
WO2024088895A1 (en) * | 2022-10-28 | 2024-05-02 | Pss Belgium Nv | Loudspeaker arrangement for a vehicle |
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FR3086915B1 (en) * | 2018-10-09 | 2021-03-05 | Renault Sas | ARRANGEMENT OF A MOTOR VEHICLE CASE CONTAINING A SPEAKER MODULE |
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US10882461B2 (en) * | 2018-01-16 | 2021-01-05 | Bose Corporation | Waveguide enabled externally ducted vehicle loudspeaker |
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US11627394B2 (en) * | 2019-12-31 | 2023-04-11 | Harman International Industries, Incorporated | Loudspeaker assembly for providing audio external to a vehicle |
WO2024088895A1 (en) * | 2022-10-28 | 2024-05-02 | Pss Belgium Nv | Loudspeaker arrangement for a vehicle |
Also Published As
Publication number | Publication date |
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EP2858377B1 (en) | 2020-08-05 |
US9591388B2 (en) | 2017-03-07 |
JP6289008B2 (en) | 2018-03-07 |
EP2858377A1 (en) | 2015-04-08 |
JP2015071372A (en) | 2015-04-16 |
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